One song that wouldn't make that best of, but still cracks me up is Albuquerque. It has funny parts, but is just really bizarre.
The thing that cracks me up the most about it, though, is how it was recorded to the CD. It's the last track on the CD, and when it was recorded, they included several minutes of a no-sound gap. Then, at the end of the gap, there's really loud screaming and nonsense noise. So what happened was you'd have the CD in your player, driving along in the car, and the songs seemingly ended, but you didn't notice because the CD didn't start over, or move to the next CD. Then, all of the sudden a loud racket scares the heck out of you. It's pretty well done.